Set allow_user_segv_handler asan option

Set allow_user_segv_handler asan option

V8's signal handler based bounds checking solution needs to be able to
install a custom signal handler. Unfortunately, asan does not allow this
by default.

BUG=v8:5277

[Eric Holk, 2017-03-03 23:16:20]

Description was changed from

==========
Set allow_user_segv_handler asan option

BUG= https://bugs.chromium.org/p/v8/issues/detail?id=5277
==========

to

==========
Set allow_user_segv_handler asan option

V8's signal handler based bounds checking solution needs to be able to
install a custom signal handler. Unfortunately, asan does not allow this
by default.

This changes fixes breakage like this:
https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20ASAN/builds/18...

BUG= https://bugs.chromium.org/p/v8/issues/detail?id=5277
==========

[Eric Holk, 2017-03-03 23:16:21]

eholk@chromium.org changed reviewers:
+ glider@chromium.org, jochen@chromium.org

[Eric Holk, 2017-03-03 23:31:53]

Description was changed from

==========
Set allow_user_segv_handler asan option

V8's signal handler based bounds checking solution needs to be able to
install a custom signal handler. Unfortunately, asan does not allow this
by default.

This changes fixes breakage like this:
https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20ASAN/builds/18...

BUG= https://bugs.chromium.org/p/v8/issues/detail?id=5277
==========

to

==========
Set allow_user_segv_handler asan option

V8's signal handler based bounds checking solution needs to be able to
install a custom signal handler. Unfortunately, asan does not allow this
by default.

BUG= https://bugs.chromium.org/p/v8/issues/detail?id=5277
==========

[Eric Holk, 2017-03-03 23:32:58]

My recent attempt to land V8's out of bounds trap handler for
WebAssembly ran into trouble with the asan bots:

https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20ASAN/builds/18...

This change sets a flag that allows custom signal handlers in asan builds.

[jochen (gone - plz use gerrit), 2017-03-06 12:56:04]

BUG= should be BUG=v8:5277

what project is this file from?

[Eric Holk, 2017-03-06 19:05:02]

Description was changed from

==========
Set allow_user_segv_handler asan option

V8's signal handler based bounds checking solution needs to be able to
install a custom signal handler. Unfortunately, asan does not allow this
by default.

BUG= https://bugs.chromium.org/p/v8/issues/detail?id=5277
==========

to

==========
Set allow_user_segv_handler asan option

V8's signal handler based bounds checking solution needs to be able to
install a custom signal handler. Unfortunately, asan does not allow this
by default.

BUG=v8:5277
==========

[Eric Holk, 2017-03-06 19:06:38]

On 2017/03/06 12:56:04, jochen wrote:
> BUG= should be BUG=v8:5277
> 
> what project is this file from?

I updated the BUG line. The file is from
https://chromium.googlesource.com/chromium/src/build.git

[jochen (gone - plz use gerrit), 2017-03-07 11:52:19]

lgtm

[Alexander Potapenko, 2017-03-07 12:14:34]

On 2017/03/07 11:52:19, jochen wrote:
> lgtm

Rubberstamp LGTM

[jochen (gone - plz use gerrit), 2017-03-07 15:27:38]

btw, build.git is a read-only copy of chromium's src/build directory - you'll
have to use a full chromium checkout and upload this patch from there ..

[Eric Holk, 2017-03-07 19:09:34]

On 2017/03/07 15:27:38, jochen wrote:
> btw, build.git is a read-only copy of chromium's src/build directory - you'll
> have to use a full chromium checkout and upload this patch from there ..

Oops, thanks for pointing this out. I moved this CL over to
https://chromium-review.googlesource.com/c/450986/